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Ray, A.R. and Konar, B. and Sarkar, G.G. and Lahiri, A. (1962) Recovery of Clean Coal for Coke-Makning from High Ash Coal and Washery Middlings by Froth-Flotation. Journal of Mines, Metals & Fuels, 10 (9). pp. 7-11. ISSN 0022-2755
